Answer: Rubidium is correct
Explanation: The six most common elements in living things are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. Atoms of these elements combine and form thousands of large molecules. These large molecules make up the structures of cells and carry out many processes essential to life.
This isn't a full question!
The molar mass of carbon (C) is 12.0107 u.
7 is atomic symbol 9 is atomic density 8 is the atomic number
Speed of light is 3.0*10^8
frequency = wavelength / speed
= 1400 Hz
